Instruction Manual

ISO-16 User Manual

Programming the ISO-16

Sealevel’s SeaI/O software is provided to assist in the development of reliable

applications for the Sealevel Systems family of digital I/O adapters. Included on the

SeaI/O CD are driver functions for use in accessing the I/O as well as helpful

samples and utilities.

Programming for Windows

The SeaI/O API (Application Programmer Interface) provides a variety of useful

high-level function calls implemented in a Windows dynamic link library (DLL).

The API is defined in the help file (Start/Programs/SeaIO/SeaIO Help) under

“Application Programmers Interface”. This help file also includes detailed

information dealing with installation / removal of the software and information

about latency, logic states, and device configuration.

For C language programmers we recommend using the API to access the ISO-16. If

you are programming in Visual Basic, using the ActiveX control included with

SeaI/O is advised.

Samples and Utilities

A variety of sample programs and utilities (both executable and source code) are

included with SeaI/O. Further documentation on these samples can be found by

selecting “Start/Programs/SeaIO/Sample Application Description”. Information

about where the files are physically stored on your disk is also included in this same

file.

Programming for Linux

SeaI/O for Linux consists of two major parts: a kernel module and a library. The

kernel module is a simple IO pass-through device, allowing the library to handle the

more sophisticated functions provided to SeaI/O users. It is provided in a ‘tarball’

format and can easily be compiled and included in the kernel build.

Application Programmers Interface (API)

Most modern operating systems do not allow direct hardware access. The SeaIO

driver and API have been included to provide control over the hardware in Windows

and Linux environments.

The purpose of this section of the manual is to help the customer with the mapping

of the API to the actual inputs and relays for the 3093 specifically. Complete

documentation of the API can be found in its accompanying help file.

Digital I/O Interface

The ISO-16 provides four parallel input/output (I/O) ports. The ports are organized

as ports A, B, C, and D. Port A and B are input ports interfaced to optically-isolated

inputs, while ports C and D are not unused. Assuming an I/O address of 300 Hex the

following table shows the Port Addresses.

Base Address Hex Decimal Mode

Port A Address 300 768

Port B Address 301 769

Optically Isolated Input Port

Port C Address 302 770

Port D Address 303 771

Unused